John_Nevill
New member
Is there a parameter that forces a higher speed shutter (1/200) in Av mode, like on the 20D.
Chuck Westfall(Canon USA) said:Hi, John:
Sorry, no. The workaround is to set the shutter speed and aperture manually.
Best Regards,
Chuck Westfall
Director/Media & Customer Relationship
Camera Marketing Group/Canon U.S.A., Inc.
Tim Rucci said:I frequently use flash in HSS on my MkIIN for birding and I often use a better beamer flash extender. I realize that there is a falloff of light in HSS mode the faster the shutter speed. But I'm curious if there is a chart somewhere that shows just how much. I have always been curious about just how much light fallof there is as shutter speed increases.
Tim Rucci said:I frequently use flash in HSS on my MkIIN for birding and I often use a better beamer flash extender. I realize that there is a falloff of light in HSS mode the faster the shutter speed. But I'm curious if there is a chart somewhere that shows just how much. I have always been curious about just how much light fallof there is as shutter speed increases.
Don Cohen said:Hi Tim,
I do the same, and checked the 550EX manual a few years back, looking for the same answer. Bottom line is that on average you lose about 1/3 of the flash's power with each stop above 1/250 second shutter speed. The exact figures are slightly different, but this was a close enough approximation for me.
Best,
Chuck Westfall(Canon USA) said:Hi, John:
Sorry, no. The workaround is to set the shutter speed and aperture manually.
Best Regards,
Chuck Westfall
Director/Media & Customer Relationship
Camera Marketing Group/Canon U.S.A., Inc.